refactor(miniooni): divide et impera (#912)

This diff splits miniooni's implementation in smaller and more
easily tractable blocks ahead of future refactoring.

I'm trying to make `miniooni oonirun -i URL` as possible as
`miniooni -i URL oonirun`, because users typically expect this
kind of flexibity from modern Unix commands.

Part of https://github.com/ooni/probe/issues/2184

internal/cmd/miniooni/oonirun.go

@@ -0,0 +1,52 @@
+package main
+
+//
+// OONI Run
+//
+
+import (
+	"context"
+	"errors"
+
+	"github.com/ooni/probe-cli/v3/internal/engine"
+	"github.com/ooni/probe-cli/v3/internal/oonirun"
+	"github.com/ooni/probe-cli/v3/internal/runtimex"
+)
+
+// ooniRunMain runs the experiments described by the given OONI Run URLs. This
+// function works with both v1 and v2 OONI Run URLs.
+func ooniRunMain(ctx context.Context,
+	sess *engine.Session, currentOptions Options, annotations map[string]string) {
+	runtimex.PanicIfTrue(
+		len(currentOptions.Inputs) <= 0,
+		"in oonirun mode you need to specify at least one URL using `-i URL`",
+	)
+	runtimex.PanicIfTrue(
+		len(currentOptions.InputFilePaths) > 0,
+		"in oonirun mode you cannot specify any `-f FILE` file",
+	)
+	logger := sess.Logger()
+	cfg := &oonirun.LinkConfig{
+		AcceptChanges: currentOptions.Yes,
+		Annotations:   annotations,
+		KVStore:       sess.KeyValueStore(),
+		MaxRuntime:    currentOptions.MaxRuntime,
+		NoCollector:   currentOptions.NoCollector,
+		NoJSON:        currentOptions.NoJSON,
+		Random:        currentOptions.Random,
+		ReportFile:    currentOptions.ReportFile,
+		Session:       sess,
+	}
+	for _, URL := range currentOptions.Inputs {
+		r := oonirun.NewLinkRunner(cfg, URL)
+		if err := r.Run(ctx); err != nil {
+			if errors.Is(err, oonirun.ErrNeedToAcceptChanges) {
+				logger.Warnf("oonirun: to accept these changes, rerun adding `-y` to the command line")
+				logger.Warnf("oonirun: we'll show this error every time the upstream link changes")
+				panic("oonirun: need to accept changes using `-y`")
+			}
+			logger.Warnf("oonirun: running link failed: %s", err.Error())
+			continue
+		}
+	}
+}